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Repair guides and support for C/K pickup trucks sold by General Motors under the GMC brand, including the GMC Sierra.

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Why are brakes dragging after vacuum booster change

Replaced vacuum booster and master cylinder, then bled the brakes. After about ten miles, the brakes start grabbing when no pedal is pushed.

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You don't say how old the car or truck are or front or back?? Check the front calipers, could be old and hanging up.

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Vacuum line from manifold can collapse and cause brakes to overheat. GMC Sierra trucks have been recalled in the past to replace vacuum line.Where the line bends behind manifold. Also old rubber line will start getting soft with age and heat.

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